universe@0: /*
universe@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
universe@0:  * Copyright 2023 Mike Becker. All rights reserved.
universe@0:  *
universe@0:  * Redistribution and use in source and binary forms, with or without
universe@0:  * modification, are permitted provided that the following conditions are met:
universe@0:  *
universe@0:  *   1. Redistributions of source code must retain the above copyright
universe@0:  *      notice, this list of conditions and the following disclaimer.
universe@0:  *
universe@0:  *   2. Redistributions in binary form must reproduce the above copyright
universe@0:  *      notice, this list of conditions and the following disclaimer in the
universe@0:  *      documentation and/or other materials provided with the distribution.
universe@0:  *
universe@0:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
universe@0:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
universe@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
universe@0:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
universe@0:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
universe@0:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
universe@0:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
universe@0:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
universe@0:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
universe@0:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
universe@0:  * POSSIBILITY OF SUCH DAMAGE.
universe@0:  */
universe@0: 
universe@6: #include "ascension/window.h"
universe@7: #include "ascension/context.h"
universe@7: #include "ascension/error.h"
universe@9: #include "ascension/utils.h"
universe@0: 
universe@0: #include <cx/printf.h>
universe@0: 
universe@6: #include <GL/glew.h>
universe@6: 
universe@0: static void asc_gl_debug_callback(
universe@0:         GLenum source, GLenum type, GLuint id, GLenum severity,
universe@0:         GLsizei length, const GLchar* message,
universe@0:         const void* userParam
universe@0: ) {
universe@0:     cxmutstr buf = cx_asprintf(
universe@0:             "source = %d, id = %u, type = %d, severity= %d, message = %.*s",
universe@0:             source, id, type, severity, length, message);
universe@0:     if (type == GL_DEBUG_TYPE_ERROR) {
universe@0:         asc_error(buf.ptr);
universe@0:     } else {
universe@16:         asc_dprintf("GL debug: %.*s", (int)buf.length, buf.ptr);
universe@0:     }
universe@0:     cx_strfree(&buf);
universe@0: }
universe@0: 
universe@0: void asc_window_settings_init_defaults(AscWindowSettings* settings) {
universe@0:     settings->depth_size = 24;
universe@0:     settings->vsync = 1;
universe@3:     settings->dimensions.width = 800;
universe@3:     settings->dimensions.height = 600;
universe@0:     settings->fullscreen = 0;
universe@13:     settings->gl_major_version = 4;
universe@13:     settings->gl_minor_version = 0;
universe@0:     settings->title = "Ascended Window";
universe@0: }
universe@0: 
universe@29: static void asc_window_init_scenes(AscWindow *window) {
universe@29:     asc_scene_init(&window->ui);
universe@29: }
universe@29: 
universe@7: AscWindow *asc_window_initialize(unsigned int index, AscWindowSettings const *settings) {
universe@7:     if (index >= ASC_MAX_WINDOWS) {
universe@7:         asc_error("Maximum number of windows exceeded.");
universe@7:         return NULL;
universe@7:     }
universe@7:     AscWindow *window = &asc_context.windows[index];
universe@7:     if (window->id > 0) {
universe@7:         asc_error("Cannot create window - slot already occupied.");
universe@7:         asc_dprintf("Tried to create window with index %u", index);
universe@7:         return NULL;
universe@7:     }
universe@7: 
universe@0:     Uint32 flags = SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN;
universe@0:     flags |= settings->fullscreen ? SDL_WINDOW_FULLSCREEN_DESKTOP : SDL_WINDOW_RESIZABLE;
universe@0: 
universe@0:     window->window = SDL_CreateWindow(
universe@0:             settings->title,
universe@0:             SDL_WINDOWPOS_CENTERED,
universe@0:             SDL_WINDOWPOS_CENTERED,
universe@3:             settings->dimensions.width,
universe@3:             settings->dimensions.height,
universe@0:             flags
universe@0:     );
universe@0:     if (window->window == NULL) {
universe@0:         asc_error(SDL_GetError());
universe@7:         return NULL;
universe@0:     }
universe@0: 
universe@0:     window->id = SDL_GetWindowID(window->window);
universe@3:     SDL_GetWindowSize(window->window,
universe@3:             &window->dimensions.width,
universe@3:             &window->dimensions.height
universe@3:     );
universe@12:     asc_mat4f_ortho(
universe@12:             window->projection,
universe@12:             0,
universe@12:             (float) window->dimensions.width,
universe@12:             (float) window->dimensions.height,
universe@12:             0
universe@12:     );
universe@0: 
universe@0:     SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
universe@0:     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, settings->gl_major_version);
universe@0:     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, settings->gl_minor_version);
universe@0:     SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, settings->depth_size);
universe@0:     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
universe@0:     window->glctx = SDL_GL_CreateContext(window->window);
universe@0:     if (window->glctx == NULL) {
universe@0:         asc_dprintf("Creating GL context failed for window %u", window->id);
universe@0:     } else {
universe@0:         glewExperimental = GL_TRUE;
universe@0:         GLenum err = glewInit();
universe@0:         if (err == GLEW_OK) {
universe@0:             SDL_GL_SetSwapInterval(settings->vsync);
universe@0:             glEnable(GL_DEPTH_TEST);
universe@0:             glEnable(GL_BLEND);
universe@0:             glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
universe@0:             glEnable(GL_DEBUG_OUTPUT);
universe@0:             glDebugMessageCallback(asc_gl_debug_callback, NULL);
universe@16: 
universe@0:             asc_dprintf("Window %u initialized", window->id);
universe@16:             if (asc_primitives_init(&window->primitives)) {
universe@29:                 asc_window_init_scenes(window);
universe@16:                 asc_context.active_window = window;
universe@16:                 return window;
universe@16:             } else {
universe@16:                 asc_dprintf("!!! Creating primitives for window %u failed !!!", window->id);
universe@16:             }
universe@0:         } else {
universe@0:             asc_error(glewGetErrorString(err));
universe@0:         }
universe@0:     }
universe@0: 
universe@0:     // cleanup on error
universe@0:     if (window->glctx != NULL) {
universe@0:         SDL_GL_DeleteContext(window->glctx);
universe@0:     }
universe@0:     window->glctx = NULL;
universe@0:     SDL_DestroyWindow(window->window);
universe@0:     window->window = NULL;
universe@0:     window->id = 0;
universe@0: }
universe@0: 
universe@7: void asc_window_destroy(AscWindow* window) {
universe@7:     // safeguard
universe@7:     if (window->id == 0) return;
universe@7: 
universe@16:     // this window cannot be active anymore
universe@16:     if (asc_context.active_window == window) {
universe@16:         asc_context.active_window = NULL;
universe@16:     }
universe@16: 
universe@29:     // destroy all scenes
universe@29:     asc_scene_destroy(&window->ui);
universe@29: 
universe@16:     // release context related data (we have to make the GL context current for this)
universe@16:     SDL_GL_MakeCurrent(window->window, window->glctx);
universe@16:     asc_primitives_destroy(&window->primitives);
universe@16: 
universe@7:     // destroy the GL context and the window
universe@0:     if (window->glctx != NULL) {
universe@0:         SDL_GL_DeleteContext(window->glctx);
universe@0:     }
universe@0:     if (window->window != NULL) {
universe@0:         SDL_DestroyWindow(window->window);
universe@0:     }
universe@0: 
universe@16:     // if another window was active, make the other context current again
universe@16:     if (asc_context.active_window != NULL) {
universe@16:         AscWindow const *aw = asc_context.active_window;
universe@16:         SDL_GL_MakeCurrent(aw->window, aw->glctx);
universe@16:     }
universe@16: 
universe@0:     // clean the data
universe@0:     asc_dprintf("Window %u and its OpenGL context destroyed.", window->id);
universe@0:     memset(window, 0, sizeof(AscWindow));
universe@0: }
universe@0: 
universe@0: void asc_window_sync(AscWindow const* window) {
universe@16:     AscWindow const *active_window = asc_context.active_window;
universe@16:     if (window != active_window) {
universe@16:         asc_window_activate(window);
universe@16:     }
universe@29: 
universe@29:     // Clear viewport for new frame
universe@3:     glViewport(0, 0, window->dimensions.width, window->dimensions.height);
universe@0:     glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
universe@0:     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
universe@29: 
universe@29:     // Draw the UI
universe@29:     asc_scene_draw(&window->ui);
universe@29: 
universe@29:     // Swap Buffers
universe@29:     SDL_GL_SwapWindow(window->window);
universe@29: 
universe@16:     if (window != active_window) {
universe@16:         asc_window_activate(active_window);
universe@16:     }
universe@0: }
universe@16: 
universe@16: void asc_window_activate(AscWindow const *window) {
universe@16:     SDL_GL_MakeCurrent(window->window, window->glctx);
universe@34:     asc_context.active_window = (AscWindow *)window;
universe@16: }